哪裏是我的SQL代碼中的錯誤？

Question

SQL命令：

UPDATE table1 
SET colOne=1 
WHERE id EXISTS (
SELECT IF(col1=19,col2,col1) AS id 
FROM table2 
WHERE 
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19)) 
) 

內SELECT查詢單獨做工精細

Answer 1

UPDATE table1 
SET colOne=1 
WHERE id IN (
SELECT IF(col1=19,col2,col1) AS id 
FROM table2 
WHERE 
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19)) 
) 

Answer 2

您的意思是使用=代替存在

UPDATE table1 
SET colOne=1 
WHERE id = (
SELECT IF(col1=19,col2,col1) AS id 
FROM table2 
WHERE 
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19)) 
) 

Answer 3

，你也可以做到這一點

UPDATE table1 
SET colOne=1 
WHERE EXISTS (
SELECT IF(col1=19,col2,col1) AS id 
FROM table2 
WHERE 
(col3=19 AND col4='X') 
OR 
(col3=0 AND col4='Y' AND (col1=19 OR col2=19)) 
)